Up is a 2009 American animated comedy-drama adventure film produced by Pixar Animation Studios for Walt Disney Pictures. The film was directed by Pete Docter, co-directed by Bob Peterson, and produced by Jonas Rivera, from a screenplay written by Peterson and Docter, and a story conceived by the duo and Tom McCarthy. The film stars the voices of Ed Asner, Christopher Plummer, Jordan Nagai, and Bob Peterson. The film centers on Carl Fredricksen (Asner), an elderly widower who travels to South America with youngster Russell (Nagai) in order to fulfill a promise that he made to his late wife Ellie. In the jungle, they encounter an exotic bird and discover someone has sinister plans to capture it.

Originally titled Heliums, Docter conceived the outline for Up in 2004 based on fantasies of escaping from life when it became too irritating. He and eleven other Pixar artists spent three days in Venezuela for research and inspiration. The designs of the characters were caricatured and stylized considerably, and animators were challenged with creating realistic cloth. Composer Michael Giacchino composed the film's score. It was Pixar's first film to be presented in 3D format.

Up debuted at the 62nd Cannes Film Festival on May 13, 2009, and was released in the United States on May 29. It received acclaim for its screenplay, animation, characters, themes, narrative, emotional depth, humor, Asner's vocal performance, Giacchino's musical score, and its opening montage. The National Board of Review and the American Film Institute named Up one of the top-ten films of 2009. Up earned $735.1 million worldwide, finishing its theatrical run as the sixth-highest-grossing film of 2009. It was nominated for five awards at the 82nd Academy Awards, winning two, and received numerous other accolades. Among its Academy Award nominations, it became the second of three animated films ever to receive a nomination for the Academy Award for Best Picture (after 1991's Beauty and the Beast and before 2010's Toy Story 3), ultimately losing to The Hurt Locker. Since then, it has been and continues to be regarded as one of the greatest animated films of the 21st century and of all time. A short-form sequel series, Dug Days, premiered on Disney+ on September 1, 2021.